Environment proficiency
Environment is a named skill proficiency; the source gives it as an example of a skill that improves movement and resistance.
How it works
Raising Environment proficiency allows higher jumps and more resistance to hostile environmental effects. Skill points earned through quests can be spent on it. After character creation, skill increases are permanent, so increasing Environment commits points that cannot be reassigned later according to the evidence.
Read the supporting references
Character progression and equipment choices in the original Deus Ex: skill proficiencies, augmentations, weapon upgrades, and inventory tools. Excludes mechanics described for sequels, mods, and the Paradise Station fan suggestion. Guidance explains the referenced mechanics; it is not a tested damage ranking. Check the stated edition and source version before applying a patch-specific detail.